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38 Ocean Alexander

Discussion in 'Ocean Alexander Yacht' started by Mike Moffitt, Oct 24, 2020.

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  1. Mike Moffitt

    Mike Moffitt New Member

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    Oct 24, 2020
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    2
    Location:
    Juneau, Alaska
    Considering purchasing a 1985 38' ocean alexander. Vessel has twin Perkin 135's with approximately 1600 hours. What should I see for fuel consumption at cruise speed? Have a old survey that says 8gph at 8knts. Current owner says 5gph at 8knts and 3.5gph at 7knts.
  2. Capt J

    Capt J Senior Member

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    Jul 11, 2005
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    Location:
    Fort Lauderdale
    Sounds correct, but depends on current.......But at each RPM level should burn that I'd guess.
  3. NYCAP123

    NYCAP123 Senior Member

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    Mar 14, 2008
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    11,218
    Location:
    Long Island, NY
    I'd guess you're looking at the difference between the factory specs from the surveyor and the owner's math. The day he figured it was he mostly cruising with the current? I'd go by the factory specs.
  4. Mike Moffitt

    Mike Moffitt New Member

    Joined:
    Oct 24, 2020
    Messages:
    2
    Location:
    Juneau, Alaska
    Obviously current plays a role and yes I am
    Going by what the survey says versus owner. Am looking for someone with this style boat that might be able to give me more realistic numbers. Thank You
  5. Capt J

    Capt J Senior Member

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    13,871
    Location:
    Fort Lauderdale
    Did the engines make WOT rpm? If so, Just find a propeller curve chart for those engines and the RPM and fuel burn will be on there. To be honest, unless one is planning a long passage with no fuel stops, for displacement speeds-not pushing a big bow wave, the fuel burn is irrelevant relative to other boat costs.

    here is a great discussion on that engine and fuel burn.

    https://www.trawlerforum.com/forums/s6/perkins-135hp-fuel-consumption-42519.html